Method, system and device for measuring bending of steam turbine rotor

Abstract

The invention relates to a steam turbine rotor bending measurement method, system and device, the steam turbine rotor bending measurement method is applied to the steam turbine rotor bending measurement device, the device comprises at least two displacement sensors, and the displacement sensors are arranged on the horizontal planes of the left end and the right end of a rotor respectively. The method comprises the steps that the axial distance between the displacement sensor and the bearings and the preset rotor length are acquired, and the distance increment between the end of the displacement sensor and the corresponding rotor side face is measured through the displacement sensor; determining the maximum bending amount of the rotor and the corresponding axial position according to the trigonometric function based on the axial distance, the preset rotor length and the maximum distance increment; the phase angle at the maximum bending amount is determined through the key phase sensor and the displacement sensor, and the circumferential position at the maximum bending amount is determined according to the phase angle.

Description

Technical Field

[0001] This application relates to the field of rotating machinery rotor bending measurement, and in particular to a method, system and apparatus for measuring the bending of a steam turbine rotor. Background Technology

[0002] As a key component of a steam turbine, the rotor must operate for extended periods under high speeds, complex loads, and harsh conditions. Rotor bending is one of the most typical potential malfunctions during operation and a core cause of major accidents such as equipment shutdowns. Therefore, rapid and accurate measurement of steam turbine rotor bending is crucial for mitigating malfunction risks.

[0003] Fault diagnosis of turbine rotor bending typically utilizes vibration analysis to identify fault characteristics through spectral analysis. However, this method cannot determine the amount and location of rotor bending. Rotor bending measurement methods usually involve selecting measurement points along the rotor's length and measuring the radial runout at each point using a dial indicator in direct contact or an eddy current sensor indirect method. This allows for the determination of the maximum bending value at each cross-section and the plotting of the bending curve. However, these measurement methods require the rotor to be fully cooled to room temperature before the cylinder is opened, leading to prolonged unit downtime, directly resulting in lost power generation and economic benefits. Furthermore, this process must be repeated for each measurement, further extending downtime and increasing maintenance costs.

[0004] Existing methods for measuring turbine rotor bending have high measurement efficiency and cost. Summary of the Invention

[0005] This application provides a method, system, and apparatus for measuring the bending of a steam turbine rotor, which at least solves the problems of high measurement efficiency and high cost in related technologies for measuring the bending of steam turbine rotors.

[0006] In a first aspect, embodiments of this application provide a method for measuring the bending of a steam turbine rotor. The method is applied to a steam turbine rotor bending measuring device, which includes at least two displacement sensors respectively disposed on horizontal planes at the left and right ends of the rotor. These horizontal planes are parallel to the line connecting the centers of the bearings at both ends of the rotor. The method includes: The axial distance between the displacement sensor and the bearing and the preset rotor length are obtained, and the distance increment between the sensor end and the corresponding rotor side is measured through the displacement sensor. The maximum bending amount of the rotor and the corresponding axial position are determined based on the axial distance, the preset rotor length, and the maximum distance increment using trigonometric functions. The phase angle at the maximum bending amount is determined by the key phase sensor and the displacement sensor, and the circumferential position at the maximum bending amount is determined based on the phase angle.

[0007] In one embodiment, the displacement sensor includes a first displacement sensor and a second displacement sensor, and acquires the axial distance, and measures the distance increment between the sensor end and the corresponding rotor side using the displacement sensor, including: Obtain the first axial distance between the first displacement sensor and the left bearing, and measure the first distance increment between the end of the first displacement sensor and the left side of the rotor using the first displacement sensor; Obtain the second axial distance between the second displacement sensor and the right bearing, and measure the second distance increment between the end of the second displacement sensor and the right side of the rotor using the second displacement sensor.

[0008] In one embodiment, determining the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, a preset rotor length, and the maximum distance increment using trigonometric functions includes: The first trigonometric function relationship is constructed based on the maximum first distance increment, the first axial distance, the maximum bending amount of the rotor, the corresponding first axial position, and the tilt angle between the left side of the rotor and the horizontal plane. The second trigonometric function relationship is constructed based on the maximum second distance increment, the second axial distance, the maximum bending amount of the rotor, the corresponding second axial position, and the tilt angle between the right side of the rotor and the horizontal plane. The maximum bending amount of the rotor and the corresponding axial position are determined based on the relationship between the first axial position, the second axial position and the rotor length, as well as the first trigonometric function relationship and the second trigonometric function relationship.

[0009] In one embodiment, determining the circumferential position at the point of maximum bending based on the phase angle includes: The circumferential position at the maximum bending amount is determined based on the relative positions of the displacement sensor and the key phase sensor, as well as the phase angle.

[0010] Secondly, embodiments of this application provide a turbine rotor bending measurement device, which is used to implement the turbine rotor bending measurement method described in the first aspect. The device includes at least two displacement sensors, which are respectively disposed on the horizontal planes at the left and right ends of the rotor. The horizontal planes are parallel to the line connecting the centers of the bearings at both ends of the rotor and are determined based on the turbine platform. The displacement sensor is used to measure the distance increment between the end of the displacement sensor and the corresponding rotor side.

[0011] In one embodiment, the device further includes a key phase sensor for cooperating with the displacement sensor to obtain the circumferential position at the maximum bending amount.

[0012] Thirdly, embodiments of this application provide a turbine rotor bending measurement system, which is used in conjunction with a turbine rotor bending measurement device to realize the turbine rotor bending measurement method described in the first aspect. The device includes at least two displacement sensors, which are respectively disposed on horizontal planes at the left and right ends of the rotor. The horizontal planes are parallel to the line connecting the centers of the bearings at both ends of the rotor. The system includes: Acquisition module: used to acquire the axial distance between the displacement sensor and the bearing and the preset rotor length, and to measure the distance increment between the sensor end and the corresponding rotor side through the displacement sensor; Calculation module: used to determine the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, the preset rotor length and the maximum distance increment using trigonometric functions; Position module: used to determine the phase angle at the maximum bending amount through the key phase sensor and the displacement sensor, and to determine the circumferential position at the maximum bending amount based on the phase angle.

[0013] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the turbine rotor bending measurement method described in the first aspect.

[0014] The turbine rotor bending measurement method, system, and apparatus provided in this application have at least the following technical effects.

[0015] This application utilizes displacement sensors installed on the outer side of the rotor to monitor rotor displacement changes in real time. Based on trigonometric functions, the relationship between rotor offset angle and displacement is expressed, allowing for real-time online calculation of rotor bending and position. This improves the speed of rotor anomaly detection without requiring unit shutdown or cylinder opening, reducing power generation losses and maintenance costs, and ensuring the economic efficiency of unit operation. Furthermore, combining the rotor displacement signal detected by the displacement sensor with the key phase signal acquired by the key phase sensor determines the specific circumferential angle of the rotor, facilitating further analysis of fault location.

[0016] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a high-pressure rotor arrangement for a steam turbine according to an exemplary embodiment; Figure 2 This is a schematic diagram illustrating a displacement sensor arrangement according to an exemplary embodiment; Figure 3 This is a flowchart illustrating a method for measuring the bending of a steam turbine rotor according to an embodiment of this application; Figure 4 This is a schematic diagram illustrating the axial displacement change of a rotor according to an exemplary embodiment; Figure 5 This is a schematic diagram of the left side structure at the maximum bending point according to an embodiment of this application; Figure 6 This is a schematic diagram of the right side structure at the maximum bending point according to an embodiment of this application; Figure 7 This is a schematic diagram illustrating the arrangement of a displacement sensor and a key phase sensor according to an exemplary embodiment; Figure 8 This is a structural block diagram of a turbine rotor bending measurement system according to an exemplary embodiment. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0019] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0020] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0021] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0022] Traditional rotor bending measurement methods typically select measurement points along the rotor's length (the more measurement points, the more accurate the bending curve). For each measurement point along the rotor's length, the radial runout is measured using either a dial indicator in direct contact or an eddy current sensor indirect method. The maximum runout value at each measurement point is usually the maximum difference between the two ends of the diameter, and the maximum bending value is half of the maximum runout value. A bending curve is then plotted with the rotor length as the abscissa, based on the maximum bending values ​​at each cross-section. However, this method requires the rotor to be fully cooled to room temperature before the cylinder is opened, resulting in low detection efficiency. Furthermore, prolonged unit downtime leads to lost power generation and economic losses, increasing maintenance costs.

[0023] Based on the above, this application provides a method, system, and apparatus for measuring the bending of a steam turbine rotor.

[0024] In a first aspect, embodiments of this application provide a method for measuring the bending of a steam turbine rotor. The method is applied to a steam turbine rotor bending measuring device, which includes at least two displacement sensors. The displacement sensors are respectively disposed on the horizontal planes at the left and right ends of the rotor, and the horizontal planes are parallel to the line connecting the centers of the bearings at both ends of the rotor.

[0025] Optionally, the displacement sensor is typically an eddy current sensor. Figure 1 This is a schematic diagram of a high-pressure rotor arrangement for a steam turbine according to an exemplary embodiment, such as... Figure 1 As shown, bearings 1 and 2 are located outside the cylinder, and the high, medium, and low pressure cylinder rotors are connected outside the cylinder via couplings. As an example, a displacement sensor is installed on each of the horizontal platforms at both ends of the rotor. Figure 2 This is a schematic diagram illustrating a displacement sensor arrangement according to an exemplary embodiment, such as... Figure 2 In the diagram, A and B are horizontal platforms on the same horizontal plane, parallel to the line connecting the centers of bearings 1 and 2 at both ends. The turbine platform serves as a reference for these horizontal planes. Displacement sensors 31 and 32 are horizontally mounted on horizontal planes A and B, respectively, to measure the change in distance between the rotor side and the sensors. When the rotor is free from bending deformation and its centerline coincides with the centerline of the bearings at both ends, the distances measured by the two sensors to the rotor side are equal.

[0026] Figure 3 This is a flowchart illustrating a method for measuring the bending of a steam turbine rotor according to an embodiment of this application, as shown below. Figure 3 As shown, the method includes: Step S101: Obtain the axial distance between the displacement sensor and the bearing and the preset rotor length, and measure the distance increment between the sensor end and the corresponding rotor side using the displacement sensor.

[0027] Optionally, the rotor length is the design value, generally obtained from the relevant equipment manual; the axial distance between the displacement sensor and the bearing can be measured on-site after the displacement sensor is installed. During turbine operation, the displacement sensor monitors the change in distance between itself and the rotor side in real time. When the rotor is not bent or deformed, refer to... Figure 3 The rotor has a length of L, and the distance between the rotor center and the horizontal plane is H, with the turbine platform as the reference. The distances from the center points of the displacement sensors at the left and right ends to the bearings are a and b, respectively. The distances H10 and H20 from the sensor ends to the rotor side measured by displacement sensors 31 and 32 are equal, and this distance is taken as the zero point of the displacement sensor.

[0028] When the rotor undergoes bending deformation, the distance from the sensor at different axial positions of the rotor to the side of the rotor also changes. The peak displacement measured by the displacement sensor is the maximum distance between the rotor side and the sensor, which is also the distance between the sensor and the circumferential position of the rotor's maximum deformation. Figure 4 This is a schematic diagram illustrating the axial displacement change of a rotor according to an exemplary embodiment, such as... Figure 4 As shown, L1 and L2 represent the axial positions corresponding to the maximum bending point of the rotor. H represents the maximum bending amount of the rotor.

[0029] In one example, the displacement sensor includes a first displacement sensor and a second displacement sensor, and step S101 includes: Step S1011: Obtain the first axial distance between the first displacement sensor and the left bearing, and measure the first distance increment between the end of the first displacement sensor and the left side of the rotor using the first displacement sensor.

[0030] Optional, Figure 5 This is a schematic diagram of the left side structure at the maximum bending point according to an embodiment of this application, as shown below. Figure 5 As shown, the first axial distance between the first displacement sensor and the left bearing is denoted as 'a', and the first distance increment between the end of the first displacement sensor and the left side of the rotor, measured by the first displacement sensor, is denoted as 'a'. H1.

[0031] Step S1012: Obtain the second axial distance between the second displacement sensor and the right bearing, and measure the second distance increment between the end of the second displacement sensor and the right side of the rotor using the second displacement sensor.

[0032] Optional, Figure 6 This is a schematic diagram of the right side structure at the maximum bending point according to an embodiment of this application, as shown below. Figure 6 As shown, the second axial distance between the second displacement sensor and the right bearing is denoted as b, and the second distance increment between the end of the second displacement sensor and the right side of the rotor, measured by the second displacement sensor, is denoted as b. H2.

[0033] In this way, by installing displacement sensors on the outside of the cylinder, rotor changes can be monitored online in real time, facilitating subsequent calculations of the rotor's bending amount and position. Rotor bending anomalies can be quickly detected without unit shutdown or cylinder opening, reducing power generation losses and maintenance costs, and contributing to ensuring the economic efficiency of unit operation.

[0034] Continue to refer to Figure 3 Step S102 is executed after step S101, as follows.

[0035] Step S102: Determine the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, the preset rotor length, and the maximum distance increment using trigonometric functions.

[0036] Optionally, a displacement sensor can be used to monitor the distance change between the sensor and the rotor side in real time, and the rotor bending amount and bending position can be determined based on the distance change. The maximum bending amount of the rotor is the distance between the center point of the maximum bending point and the original center point of the rotor at that point. The rotor tilt angle and tilt displacement are expressed by trigonometric function relationships based on the principles of trigonometric functions.

[0037] In one example, step S102 includes: Step S1021: Construct a first trigonometric function relationship based on the maximum first distance increment, the first axial distance, the maximum bending amount of the rotor, the corresponding first axial position, and the tilt angle between the left side of the rotor and the horizontal plane.

[0038] Optionally, when the rotor undergoes bending deformation, the distance from the sensor at different axial positions of the rotor to the side of the rotor will change. (Reference) Figure 5 The maximum first distance increment from the sensor end to the rotor side, measured by the first displacement sensor at the left end of the rotor, is expressed as: H1, let the angle of inclination of the left side of the rotor to the horizontal plane be... The distance between the center point O of the rotor at the point of maximum bending and the original center point of the rotor at that point is expressed as: H, according to the principle of trigonometric functions, can be expressed as:

[0039] Step S1022: Construct a second trigonometric function relationship based on the maximum second distance increment, the second axial distance, the maximum bending amount of the rotor, the corresponding second axial position, and the tilt angle between the right side of the rotor and the horizontal plane.

[0040] Optional, see reference Figure 6 The maximum second distance increment from the sensor end to the rotor side, measured by the second displacement sensor at the right end of the rotor, is expressed as: H2, let the angle of inclination of the right side of the rotor to the horizontal plane be... According to the principles of trigonometric functions, the second trigonometric function relationship can be expressed as:

[0041] Step S1023: Determine the maximum bending amount of the rotor and the corresponding axial position based on the relationship between the first axial position, the second axial position and the rotor length, as well as the first trigonometric function relationship and the second trigonometric function relationship.

[0042] Optionally, we know that L1 + L2 = L. Based on the relationship between the rotor length and axial position, and combining the above first and second trigonometric function relationships, we can derive the maximum bending amount of the rotor as:

[0043] Where L represents the rotor length, a represents the first axial distance between the first displacement sensor and the left bearing, and b represents the second axial distance between the second displacement sensor and the right bearing. L, a, and b are known quantities acquired beforehand. H1 and H2 is the measurement obtained from the displacement sensor. By substituting the known parameters, the maximum bending amount of the rotor can be determined. H.

[0044] Furthermore, by substituting the maximum bending amount into the first and second trigonometric function relationships, the rotor bending positions L1 and L2 can be obtained as follows:

[0045] The axial position of the rotor's maximum bending can be determined based on the size of L1 or L2.

[0046] In this way, displacement sensors are installed on the outside of the cylinder to monitor rotor changes online in real time. The relationship between rotor offset angle and displacement is expressed using trigonometric functions to calculate the rotor's bending and position in real time. This improves the speed of rotor anomaly detection, eliminates the need for unit shutdown and cylinder opening, reduces power generation losses and maintenance costs, and helps ensure the economic efficiency of unit operation.

[0047] Continue to refer to Figure 3 Step S103 is executed after step S102, as follows.

[0048] Step S103: Determine the phase angle at the maximum bending amount using the key phase sensor and displacement sensor, and determine the circumferential position at the maximum bending amount based on the phase angle.

[0049] Optionally, for steam turbines, key phase sensor measurement of key phase signals is a conventional method. Displacement sensors and key phase signals are connected to a vibration monitoring and analysis system to obtain the phase of the vibration signal. This vibration monitoring and analysis system includes systems such as Turbomachinery Data Manager (TDM) and Emerson CSI 6500 Machinery Health Monitor.

[0050] In one example, step S103 includes: determining the circumferential position at the maximum bending amount based on the relative positions of the displacement sensor and the key phase sensor, and the phase angle.

[0051] Optional, Figure 7 This is a schematic diagram illustrating the arrangement of a displacement sensor and a key phase sensor according to an exemplary embodiment, such as... Figure 7 As shown, if the rotor rotates clockwise, the key phase sensor 4 is located in the horizontal direction, and the displacement sensor is located at the bottom in the vertical direction, that is, the key phase sensor and the displacement sensor are 90° out of phase. When the monitoring system obtains the phase angle of the displacement sensor 31 as... At that time, the circumferential position corresponding to the maximum bending amount is counterclockwise along the key phase signal acquisition point (usually the concave point of the rotor cross-section). -90°.

[0052] In this way, the rotor displacement signal detected by the displacement sensor is combined with the key phase signal, and the displacement signal is bound to the rotor rotation angle so that each displacement data point can correspond to the specific circumferential angle of the rotor, which is beneficial for further analysis of the fault location.

[0053] In summary, this application utilizes a displacement sensor installed on the outside of the cylinder to monitor rotor changes in real time. Based on the principle of trigonometric functions, the relationship between rotor offset angle and displacement is expressed, allowing for real-time online calculation of rotor bending and position. This improves the speed of rotor anomaly detection without requiring unit shutdown or cylinder opening, reducing power generation losses and maintenance costs, and contributing to the economic efficiency of unit operation. Furthermore, by combining the rotor displacement signal detected by the displacement sensor with the key phase signal, and binding the displacement signal to the rotor's rotation angle, each displacement data point corresponds to a specific circumferential angle of the rotor, facilitating further analysis of fault locations.

[0054] Secondly, embodiments of this application provide a turbine rotor bending measurement device, which is used to implement the turbine rotor bending measurement method of the first aspect. The device includes at least two displacement sensors, which are respectively disposed on the horizontal planes at the left and right ends of the rotor. The horizontal planes are parallel to the line connecting the centers of the bearings at both ends of the rotor, and are determined based on the turbine platform. The displacement sensors are used to measure the distance increment between the end of the displacement sensor and the corresponding rotor side. The arrangement and position of the rotor and bearings have been described in the first aspect and will not be repeated here.

[0055] In one example, the device also includes a key phase sensor, which is used in conjunction with a displacement sensor to obtain the circumferential position at the point of maximum bending.

[0056] In summary, this application utilizes a displacement sensor installed on the outside of the cylinder to monitor rotor changes in real time. Based on the principle of trigonometric functions, the relationship between rotor offset angle and displacement is expressed, allowing for real-time online calculation of rotor bending and position. This improves the speed of rotor anomaly detection without requiring unit shutdown or cylinder opening, reducing power generation losses and maintenance costs, and contributing to the economic efficiency of unit operation. Furthermore, by combining the rotor displacement signal detected by the displacement sensor with the key phase signal, and binding the displacement signal to the rotor's rotation angle, each displacement data point corresponds to a specific circumferential angle of the rotor, facilitating further analysis of fault locations.

[0057] Thirdly, this application provides a turbine rotor bending measurement system, which is used in conjunction with a turbine rotor bending measurement device to realize the turbine rotor bending measurement method of the first aspect. The device includes at least two displacement sensors, which are respectively disposed on the horizontal planes at the left and right ends of the rotor, and the horizontal planes are parallel to the center line connecting the bearings at both ends of the rotor. Figure 8This is a structural block diagram of a turbine rotor bending measurement system according to an exemplary embodiment, such as... Figure 8 As shown, the system includes: Acquisition module 100: used to acquire the axial distance between the displacement sensor and the bearing and the preset rotor length, and to measure the distance increment between the sensor end and the corresponding rotor side through the displacement sensor.

[0058] Calculation module 200: used to determine the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, preset rotor length and maximum distance increment using trigonometric functions.

[0059] Position module 300: used to determine the phase angle at the maximum bending amount by means of a key phase sensor and a displacement sensor, and to determine the circumferential position at the maximum bending amount based on the phase angle.

[0060] In one example, the displacement sensor includes a first displacement sensor and a second displacement sensor, and the acquisition module 100 includes: Used to obtain the first axial distance between the first displacement sensor and the left bearing, and to measure the first distance increment between the end of the first displacement sensor and the left side of the rotor.

[0061] Obtain the second axial distance between the second displacement sensor and the right bearing, and measure the second distance increment between the end of the second displacement sensor and the right side of the rotor using the second displacement sensor.

[0062] In one example, the calculation module 200 includes: This is used to construct a first trigonometric function relationship based on the maximum first distance increment, the first axial distance, the maximum bending amount of the rotor, the corresponding first axial position, and the tilt angle between the left side of the rotor and the horizontal plane.

[0063] The second trigonometric function relationship is constructed based on the maximum second distance increment, the second axial distance, the maximum bending amount of the rotor, the corresponding second axial position, and the tilt angle between the right side of the rotor and the horizontal plane.

[0064] The maximum bending amount of the rotor and the corresponding axial position are determined based on the relationship between the first axial position, the second axial position and the rotor length, as well as the first trigonometric function relationship and the second trigonometric function relationship.

[0065] In one example, the position module 300 includes a circumferential position for determining the maximum bending amount based on the relative positions of the displacement sensor and the key phase sensor, as well as the phase angle.

[0066] In summary, this application utilizes a displacement sensor installed on the outside of the cylinder to monitor rotor changes in real time. Based on the principle of trigonometric functions, the relationship between rotor offset angle and displacement is expressed, allowing for real-time online calculation of rotor bending and position. This improves the speed of rotor anomaly detection without requiring unit shutdown or cylinder opening, reducing power generation losses and maintenance costs, and contributing to the economic efficiency of unit operation. Furthermore, by combining the rotor displacement signal detected by the displacement sensor with the key phase signal, and binding the displacement signal to the rotor's rotation angle, each displacement data point corresponds to a specific circumferential angle of the rotor, facilitating further analysis of fault locations.

[0067] Fourthly, embodiments of this application provide a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the turbine rotor bending measurement method provided in the first aspect.

[0068] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0069] In a possible implementation, the present invention can also be implemented as a program product comprising program code, which, when the program product is run on a terminal device, causes the terminal device to perform the steps of implementing the turbine rotor bending measurement method provided in the first aspect.

[0070] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method of measuring the bending of a steam turbine rotor, characterized by, The method is applied to a steam turbine rotor bending measurement device, the device comprising at least two displacement sensors, the displacement sensors being arranged on horizontal planes at left and right ends of the rotor respectively, the horizontal planes being parallel to the center line of the bearings at the two ends of the rotor, the method comprising: obtaining an axial distance between the displacement sensors and the bearings and a preset rotor length, and measuring a distance increment between the end of the displacement sensor and the corresponding side surface of the rotor by the displacement sensor; determining the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, the preset rotor length and the maximum distance increment according to a trigonometric function; determining the circumferential position at the maximum bending amount according to the phase angle at the maximum bending amount.

2. A method of measuring the bend of a steam turbine rotor according to claim 1, characterized in that, The displacement sensors comprise a first displacement sensor and a second displacement sensor, the axial distance is obtained, and the distance increment between the end of the displacement sensor and the corresponding side surface of the rotor is measured by the displacement sensor, comprising: obtaining a first axial distance between the first displacement sensor and the left bearing, and measuring a first distance increment between the end of the first displacement sensor and the left side of the rotor by the first displacement sensor; obtaining a second axial distance between the second displacement sensor and the right bearing, and measuring a second distance increment between the end of the second displacement sensor and the right side of the rotor by the second displacement sensor.

3. A method of measuring the bend of a steam turbine rotor according to claim 2, characterized in that, The determination of the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, the preset rotor length and the maximum distance increment according to a trigonometric function comprises: constructing a first trigonometric function relationship according to the maximum first distance increment, the first axial distance, the maximum bending amount of the rotor, the corresponding first axial position and the inclination angle of the left side of the rotor to the horizontal plane; constructing a second trigonometric function relationship according to the maximum second distance increment, the second axial distance, the maximum bending amount of the rotor, the corresponding second axial position and the inclination angle of the right side of the rotor to the horizontal plane; determining the maximum bending amount of the rotor and the corresponding axial position according to the relationship between the first axial position and the second axial position and the length of the rotor, and the first trigonometric function relationship and the second trigonometric function relationship.

4. A method of measuring the bend of a steam turbine rotor according to claim 1, wherein The determination of the circumferential position at the maximum bending amount according to the phase angle comprises: determining the circumferential position at the maximum bending amount according to the relative position of the displacement sensor and the key phase sensor and the phase angle.

5. A steam turbine rotor bow measuring device characterized by, The device is used to implement the steam turbine rotor bending measurement method in any one of claims 1-4, The device comprises at least two displacement sensors, the displacement sensors being arranged on horizontal planes at left and right ends of the rotor respectively, the horizontal planes being parallel to the center line of the bearings at the two ends of the rotor, the horizontal planes being determined based on the platform of the steam turbine; The displacement sensors are used to measure the distance increment between the end of the displacement sensor and the corresponding side surface of the rotor.

6. A turbine rotor bow measuring device according to claim 5, wherein, The device further comprises a key phase sensor, which is used to cooperate with the displacement sensor to obtain the circumferential position at the maximum bending amount.

7. A steam turbine rotor bow measurement system characterized by, The system is used in cooperation with a steam turbine rotor bending measurement device to realize the steam turbine rotor bending measurement method in any one of claims 1-4, the device comprising at least two displacement sensors respectively arranged on the horizontal planes at the left and right ends of the rotor, the horizontal planes being parallel to the center line of the bearings at the two ends of the rotor, and the system comprising: an acquisition module configured to acquire an axial distance between the displacement sensors and the bearings and a preset rotor length, and measure a distance increment between the end of the displacement sensor and the corresponding side surface of the rotor by the displacement sensor; a calculation module configured to determine the maximum bending amount of the rotor and the corresponding axial position based on the axial distance, the preset rotor length and the maximum distance increment according to a trigonometric function; a position module configured to determine the phase angle at the maximum bending amount by the key phase sensor and the displacement sensor, and determine the circumferential position at the maximum bending amount according to the phase angle.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the steam turbine rotor bending measurement method in any one of claims 1-4.

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